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CVE-2026-86076

CVE-2026-86076 · n8n: Expression Sandbox Escape in Editor-UI Enables Stored Cross-User JavaScript Execution

This page contains facts from public vulnerability sources. Check the original advisory before updating.

n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the expression compiler sanitizer resolved through dynamically scoped this and did not reject reserved class member names. A class field named __sanitize could rebind the sanitizer and reach the Function constructor, enabling backend code execution and editor-preview JavaScript execution. The affected AST hook is PrototypeSanitizer in packages/workflow/src/expression-sandboxing.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.

CVSS 8.7 · High · EPSS 0.8% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • n8n

    Versions
    • >= 2.38.0, < 2.38.2: Affected
    • >= 2.0.0, < 2.37.7: Affected
    • < 1.123.76: Affected

    No fix published

  • n8n npm

    Affected ranges
    • SEMVER: < 1.123.76

    Update to 1.123.76

  • n8n npm

    Affected ranges
    • SEMVER: ≥ 2.38.0, < 2.38.2

    Update to 2.38.2

  • n8n npm

    Affected ranges
    • SEMVER: ≥ 2.0.0, < 2.37.7

    Update to 2.37.7

Original sources

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